Dynamics of Water Clusters Confined in Ionic Liquid at an Elevated Pressure.

ABSTRACT: Over the years, numerous experimental and theoretical efforts have been dedicated to investigating the mysteries of water and determining its new unexplored physical properties. Despite this, high-pressure studies of water and aqueous mixtures close to the glass transition still represent an unknown area of research. Herein, we address a fundamental issue: the validity of the density scaling concept for fast water dynamics. For this purpose, we performed ambient and high-pressure dielectric measurements of a supercooled equimolar aqueous mixture of an acidic ionic liquid. All isothermal and isobaric relaxation data describing the time scale of charge transport (τ_σ) and fast dynamics within the water clusters (τ_ν) reveal visual evidence of a liquid-glass transition. Furthermore, both relaxation processes satisfy the ρ^γ/T scaling concept with a single exponent γ = 0.58. Thus, the scaling exponent is a state-point-independent parameter for the dynamics of water clusters confined in ionic liquid investigated in the pressure range up to 300 MPa.

SUBMITTER: Kumar Murali A 

PROVIDER: S-EPMC10983063 | biostudies-literature | 2024 Mar

REPOSITORIES: biostudies-literature